Sort test tasks based on last execution time. (#38)

Permits tests to run faster, this functionality must have been lost in some refactoring effort, and was not covered by tests.

Author: pbos

gtest_parallel.py

@@ -532,7 +532,7 @@ def find_tests(binaries, additional_args, options, times):
 
  test_count += 1
 
- return tasks
+ return sorted(tasks)
 
 
 def execute_tasks(tasks, pool_size, task_manager,